Device for adjusting window-curtains



(No Model.) 7

D. F. MCDONALD. DEVICE FOR ADJUSTING WINDUW GUR'TAINSL No. 442,590.Patented Dec. 9, 1890.

mmssrs: INVENTOB mom:

UNITED STATES PATENT OFFICE.

DUNCAN F. MCDONALD, OF BERKELEY, CALIFORNIA.

DEVICE FOR ADJUSTING WINDOW-CURTAINS.

SPECIFICATION forming part of Letters Patent No. 442,590, dated December9, 1890.

Application filed September 21, 1889- Serial No. 324,666- (No model.)

To all whom it may concern:

Be it known that I, DUNCAN F. MCDONALD, a citizen of the United States,residing at Berkeley, in the county of Alameda and State .of California,have invented certain new and useful Improvements in Devices forAdjusting VIIKIOW-CUFIELIDS; and I do declare the following to be afull, clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame, reference being had to the accompanying drawings, and to thefigures of reference marked thereon, which form a part of thisspecification.

My invention relates to improvements in window-curtain adjusters; andthe object of my invention is to provide a device of simpleconstruction, economical in cost, durable, easily operated, andreliable; to which end my invention consists of the features hereinafterdescribed and claimed.

In the drawings is illustrated an embodiment of my invention, in which-Figure 1 is a side elevation of my improved device, showing the same inposition for use, but not attached or secured to the windowcasing or thecurtain-roller. Fig. 2 is a vertical section of the lower part of thedevice, taken on the line 00 a, Fig. 1, the upper portion being shown infront elevation secured to the curtain-roller.

In the views let the reference-numeral1 indicate a curtain-roller, toone end of which is secured a sprocket-wheel 2, which is made stationaryon the end of the roller in any suitable manner, as by nails or screwspassin g through openings 3 in the sprocket-wheel. The roller isprovided with a journal 4: in each extremity thereof, by means of whichthe roller is secured in bearings in the casing.

5 is a second sprocket-wheel suitably secured to a plate 6, said platebeing made fast to the window-casing at a suitable distance below theroller. A screw 7 passing through wheel 5 and plate 6, affords means ofsecuring the plate to the casing, and also forms an axis for wheel 5.

w 8 is a locking device hinged-to plate 6 and adapted to engage the pinsor cogs 9 of the wheel 5 for the purpose of locking the device whendesired.

11 is an endless chain working on wheels 2 and 5, the links of the chainbeing adapt-ed to engage the pins 9 and 10 of the wheels 5 and 2.

In the use of my improved. device the curtain is adjusted to anyheight'desired by taking hold of the chain and raising up or pullingdown, according as it is desired to raise or lower the curtain, whichwhen properly adjusted may be held or locked in this position by the useof the device 8, which is thrown over wheel 5, this locking device beingadapted to engage a pin 9 upon the wheel 5, or to engage the wheelbetween two pins 9, the locking-plate being of sufficient width to fitsnugly between two pins 9. WVhen it is desired to raise or lower thecurtain, the lock is raised from its engagement with wheel 5 and thechain again used, as before described.

Having thus described my invention, what I claim is- In a window-curtainadjuster, the combination, with the curtain-roller, of a sprocketwheel2, made fast to one end of the roller, a plate 6, made fast to thewindow-casing at a suitable distance below the roller, a sprocketwheel5, pivoted to plate 6, a chain having links adjusted to engage the pinsin wheels 2 and 5, and a locking device 8, hinged to plate 6 and adaptedto lie across the periphery of wheel 5, said device being provided withan aperture for the reception of a lug of the wheel, and also sofashioned as to fit nicely between two lugs of the wheel when in thelocking position, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

DUNCAN F. MCDONALD.

lVitnesses:

R. J. VAN VALKENBURG, S. BARNHILL.

